NIDEK ARK-F, AR-F Specifications

ARK-F/AR-F Specifications

Auto refractometer

Measurement range

Minimum measurable pupil diameter

Auto keratometer

Measurement range

Sagittal measurement
Vision comparison
Retro illumination image
Accommodation measurement range
Pupillary distance measurement range
Corneal size measurement range
Pupil size measurement range
Auto tracking
Auto shot
Auto measurement
Auto transition from right to left eye measurement
Display
Printer
Interface

Power supply
Power consumption
Dimensions/Mass

Standard accessories

Optional accessories

*1 Not available for the AR-F
*2 Only for the countries (regions) certified by the Radio Law

*1

Sphere -30.00 to +25.00 D (VD = 12 mm) (0.01/0.12/0.25 D increments)
Cylinder 0 to ±12.00 D (0.01/0.12/0.25 D increments)
Axis 0 to 180° (1°/5° increments)
ø2 mm

Curvature radius 5.00 to 13.00 mm (0.01 mm increments)
Refractive power 25.96 to 67.50 D (n = 1.3375) (0.01/0.12/0.25 D increments)
Cylindrical power 0 to ±12.00 D (0.01/0.12/0.25 D increments)
Axis 0 to 180º (1°/5° increments)
25º each from the center (superior side, inferior side, temporal side, nasal side)
Available with scenery chart
Available
0 to 10.00 D (0.01/0.12/0.25 D increments)
30 to 85 mm (1 mm increments) (Near point PD: 28 to 80 mm at WD = 40 cm)

10.0 to 14.0 mm (0.1 mm increments)

1.0 to 10.0 mm (0.1 mm increments)
Fully automatic 3D tracking(X-Y-Z directions)
Available
Start automatically after eye detection
Available

7.0-inch touch color LCD with tilting and swiveling functions
Thermal line printer with easy loading and auto cutter
RS-232C: 2 ports
USB: 2 ports
LAN: 1 port
Wireless LAN (WLAN): 1ch (Type A and B only)

*2

100 to 240 V AC, 50/60 Hz
100 VA
305 (W) x 492 (D) x 488 (H) mm / 20 kg

12.0 (W) x 19.4 (D) x 19.2 (H)" / 44 lbs.
Printer paper, Power cord, Dust cover, Chinrest paper, Fixing pins for chinrest paper,
Spherical model eye with integrated contact lens holder
Communication cable (RS-232C), Barcode scanner, Magnetic card reader,
Hand-held control (wired or wireless type), Tablet control software

Auto Ref/Keratometer

Auto Refractometer AR-F

ARK-F

Product/Model name: AUTO REF/KERATOMETER ARK-F

AUTO REFRACTOMETER AR-F

Brochure and listed features of the device are intended for non-US practitioners.

Specifications may vary depending on circumstances in each country.

Specifications and design are subject to change without notice.

The tablet described in this brochure is not included or sold with the ARK-F/AR-F.

HEAD OFFICE
(International Div.)

34-14 Maehama,
Hiroishi-cho, Gamagori,
Aichi 443-0038, JAPAN
TEL:

[phone]

URL: www.nidek.com

[ Manufacturer ]

TOKYO OFFICE
(International Div.)

3F Sumitomo Fudosan Hongo
Bldg., 3-22-5 Hongo, Bunkyo-ku,
Tokyo 113-0033, JAPAN
TEL:

[phone]

URL: www.nidek.com

NIDEK INC.

2040 Corporate Court,
San Jose, CA 95131, U.S.A.
TEL:

[phone]
[phone]
(US Only)
URL: usa.nidek.com

NIDEK S.A.

Europarc,
13 rue Auguste Perret,
94042 Créteil, FRANCE
TEL:
URL: www.nidek.fr

[phone]

NIDEK TECHNOLOGIES S.R.L.

Via dell’Artigianato,
6/A, 35020 Albignasego (Padova),
ITALY
TEL:

[phone] / 8626399

URL: www.nidektechnologies.it

NIDEK (SHANGHAI) CO., LTD.

Rm3205,Shanghai Multi
Media Park, No.1027 Chang
Ning Rd, Chang Ning District,
Shanghai, CHINA 200050

[phone]

TEL:
URL: www.nidek-china.cn

NIDEK SINGAPORE PTE. LTD.

51 Changi Business Park
Central 2, #06-14,
The Signature 486066,
SINGAPORE

[phone]

TEL:
URL: www.nidek.sg

ARK-F/AR-F_B01E002

More comfortable,
more seamless

for anyone

Reliably accurate eye examination equipment with comfortable operability has become worldwide standard.

It is used every day; that's why NIDEK stands behind it with complete dedication and professionalism.

Our ARK-F/AR-F impressively changes your “standard” with its smooth, fully-automatic and precise

measurement and high freedom of installation, in addition to the conventional accurate measurement.

Advanced operation

Remarkably easy workflow
through fully-automatic
measurement

Simply by placing the chin on the
chinrest, NIDEK eye detection camera
automatically detects the position of
the eyes and measurement starts
without pressing any button. Gentle
voice guidance facilitates smooth
measurement for any operator.

No direct

operation required

“Measurement starting.

Please keep your hands away

1 2 3

A patient places chin on the chinrest.
The device automatically detects the

position of the eyes and eye level.

from the device”

The measuring unit automatically moves to the measuring

position with the screen changing to the patient’s eye

image and measurement starts. The device then moves to

“Please open your eyes wide.” “Measurement finished.”

When measured values for the

left and right eyes are obtained,

the opposite eye and repeats the procedure.

measurement ends.

Selectable and intuitive manual operation

Manual measurement using the large, durable 7.0-inch touch screen is
also possible with the ARK-F/AR-F. Alignment is easily achieved by simply
long-pressing a position on the screen and an icon. Clearly identifiable
icons assure intuitive operation. Moreover, a newly designed hand-held
control and tablet control software are available as options that increase
operator freedom and productivity.

Optional accessories

Hand-held control (wired/wireless)

Ergonomically designed palm-fit
controller offers an all-new handling
experience. Simple and well-organized
button layout provides excellent
single-handed operation. It can be
stored in a dedicated holder which can
be attached to either side of the
ARK-F/AR-F.

Wireless type of
hand-held control

Tablet control software

When using a tablet as a
controller, the screen of
the ARK-F/AR-F is
duplicated on the tablet
screen. It is even possible
to measure with the same
accuracy and comfort from
a remote location.

Accurate measurement

Large pupil zone imaging method

The large pupil zone imaging method enables the
measurement of wider area refraction up to 6 mm diameter
and can indicate the difference between the wide area
refraction and central area refraction of up to 3.5 mm
diameter. These pupil diameters are measured simultaneously.
The difference of the measurement allows assessment of the
effect of pupil size such as a vision in dim light.

Super luminescent diode and highly sensitive CCD

Incorporation of the super luminescent diode (SLD) provides a
sharper and clearer image compared to a conventional LED.
The highly sensitive CCD detects the ring image even if the

fundus reflection is weak. The system, that combines

the SLD and highly sensitive CCD, significantly

improves measurement capability even

SLD

Half
mirror

sensitive

Eye

Reflective
mirror

Emitted SLD light Reflected light Ring image

in dense cataractous eyes.

Ring lens

Hyperopia Emmetropia Myopia

Highly

CCD

Astigmatism Astigmatism

Simulated ring image

ø1 to 3.5 mm area

ø1 to 6 mm area

Ring image

SLD (normal eye) LED (normal eye)

SLD (cataractous eye)* LED (cataractous eye)*

Captured ring image

* In-house data of a cataractous model eye

Optimal fogging to minimize accommodation

Fogging is performed after correcting the patient’s astigmatism with built-in cylinder
lenses. This allows the patient to view the target clearly and minimizes the interference
with accommodation even in high astigmatism.

Keratometry measurement with mire ring

The mire ring is used to measure keratometry. It reduces eyelid artifacts.

Measurement with four points Measurement with mire ring

NIDEK eye detection camera

When the device recognizes that the patient's chin is correctly positioned on the chinrest, the new NIDEK
eye detection camera (NEDC) automatically starts eye detection. Since NEDC holds eye position, faster and
more precise alignment is possible without wasted adjustment time.

(NEDC)

(available for the ARK-F)

Flexible and space-saving design

Large tilt and swivel monitor

Since the screen can be continuously tilted and swivel, the ARK-F/AR-F can be placed
anywhere in an examination area; installation against a wall or in a corner of the room is now
possible. Of course, the conventional face-to-face position is still possible, but more
comfortable than ever. Freedom of operator mobility even enables the support of a patient’s
eyelids during measurement. Flexible layout and space saving design contribute to improved
productivity and efficiency.

Practical and user-friendly features

Patient-friendly accommodation measurement

Objective measurement of accommodation is performed with patient’s
focusing on a target which moves from distant to near. Intelligent
algorithm detects the patient response and reduces the measurement
time in cases with a slow or weak accommodative response.
The accommodation measurement helps to assess pseudomyopia,
eyestrain, and accommodative palsy.

Retroillumination image and NIDEK cataract indices

The retroillumination image enables the
observation of opacity of the optical media of
the eye. NIDEK cataract indices indicate the
severity of the opacity and help to assess the
progression of pathology.

Eye with dense opacity Eye with light opacity

COI.H

COI.A

The NIDEK cataract indices are for reference only.
The following conditions may indicate different indices from ones
of actual status.

Peripheral image is darkly captured due to alignment position.
Opacities are not in focus.
Bright spot reflecting observation light occurs on the cornea apex.
Position of the 3 mm diameter circle is shifted due to
incorrect pupil detection caused by opacity location.

Opacity size within a diameter of 3 mm
of the center (vertical diameter): mm

Opacity proportion within a diameter of 3 mm
of the center: %

Opacity proportion within the entire periphery: %

POI

Cataract indices

Emmetropia

Presbyopia

Quick shot mode

Quick shot mode may be beneficial for children
or others, who have difficulty holding their eyes
steady during an examination.

*Quick shot mode is for reference.

Summary display, printout and transfer of measured values

Various measured values can be displayed simultaneously on the summary
screen allowing easy and quick confirmation and printing. Measured data
can be exported to the NIDEK refractor or a connected computer.

Summary display

Printout example

Selectable model types

With the various models
available, the ARK-F/AR-F
will satisfy every user’s
needs.

WLAN for connecting with

WLAN for tablet control

〇: Available, : Not available

Tablet control is only available for the type A.
Each model is factory setting and cannot be modified later.

Type

other devices

Manual operation

CS, PS, and PD measurement

CS (corneal size), PS (pupil size), and PD
(pupillary distance) values can be measured
manually based on eye images.

High speed printer with easy loading
& auto cutter

The printer paper can be changed easily.
The data sheet is cut by an auto cutter for
quick and easy detachment.

A

〇

〇

· Touch panel

·

Hand-held control or tablet control

B

〇



· Touch panel

· Hand-held control

C





Recall function for instant vision comparisons

The recall function provides the instant comparison between vision
corrected with AR data and uncorrected vision or vision corrected with
the data of patient’s own glasses. For the patient, this function
demonstrates the difference in vision and the necessity for more
appropriate vision correction.

Distance vision corrected with AR data

Near vision corrected with AR data

Vision comparisons

Uncorrected distance vision

Distance vision corrected with LM data

Uncorrected near vision

Near vision corrected with LM data

*

*

*The data of patient’s own glasses has to be
imported from a NIDEK lensmeter.

Network configuration with
high flexibility

Quick and easy wireless data transfer

NIDEK refraction products allow for quick and easy

*

wireless data transfer
infrared communication.
This is helpful for making a simple refraction system
without complicated wired connection.

*The specifications for wireless data transfer differ according to each product
and from country to country.
The requirements also differ depending on the method of wireless data transfer.

using the Eye Care card, WLAN or

Intelligent

Refractor

oror

Auto

Lensmeter

or

This configuration is just an example.